Commandments for a Gangster (1968)

Directed by Alfio Caltabiano

Northon is a retired gangster wants to avenge the death of his sister, who was married to Frank Cline. Cline disappeared while transporting a large shipment of the Organization's gold, leaving three dead bodies behind him. Northon follows the trail to the sunken ship and tries to beat rival gangsters to the lost gold.